Cleaning sandstone wall

Discussion in 'Bricks, Masonry and Concrete' started by soparklion11, May 18, 2017.

  1. May 18, 2017 #1

    soparklion11

    soparklion11

    soparklion11

    Well-Known Member

    Joined:
    Apr 28, 2012
    Messages:
    66
    Likes Received:
    2
    I live in Pittsburgh in a house from the 1940s and scars from the pre-1980s steel mill pollution remain on my exterior sandstone wall.

    I pressure washed with an ~1,800 psig pressure washer that only removed some surface dirt.

    I then used muriatic acid at 1:8 dilution: wet the stone, applied with acid brush, let it ist for ~8-10 minutes and pressure washed. That cleaned some of the stones, but left some of the stones splotchy with areas that are bleached, some that are now clean and other areas that remain black.

    I'm considering:
    1. Repeating the muriatic acid
    2. Renting a more powerful pressure washer.

    Any advice? Many thanks, Brian
     
  2. May 18, 2017 #2

    nealtw

    nealtw

    nealtw

    Contractor retired

    Joined:
    Nov 4, 2010
    Messages:
    23,892
    Likes Received:
    3,117
    soparklion11 likes this.
  3. May 18, 2017 #3

    soparklion11

    soparklion11

    soparklion11

    Well-Known Member

    Joined:
    Apr 28, 2012
    Messages:
    66
    Likes Received:
    2
    Thanks Neal! That is an excellent site that I've never seen before.
     
    nealtw likes this.

Share This Page